Md is an emulator for the Sega Megadrive/Genesis. It executes
the romfile given as an argument. The z, x, a, return and shift
keys correspond to A, B, C, Start and Select, respectively. Other
keys:
Esc Pause the emulator.
Del Exit the emulator.

Command line options:
–a Enable audio output.
–x Scale the screen to a given factor regardless of the window's
size.